Writes an UTF8 string to a byte buffer. - Java java.nio

Java examples for java.nio:ByteBuffer String

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Description

Writes an UTF8 string to a byte buffer.

Demo Code

/*//from   w w  w.  j av  a2 s.  co m
 * This file is part of Flow Networking, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2013 Spout LLC <http://www.spout.org/>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
//package com.java2s;

import java.io.DataOutput;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class Main {
    /**
     * Writes an UTF8 string to a byte buffer.
     *
     * @param buf The byte buffer to write too
     * @param value The string to write
     * @throws java.io.IOException If the writing fails
     */
    public static void writeUTF8(DataOutput buf, String value)
            throws IOException {
        final byte[] bytes = value.getBytes(StandardCharsets.UTF_8);
        if (bytes.length >= Short.MAX_VALUE) {
            throw new IOException(
                    "Attempt to write a string with a length greater than Short.MAX_VALUE to ByteBuf!");
        }
        // Write the string's length
        writeVarInt(buf, bytes.length);
        buf.write(bytes);
    }

    /**
     * Writes an integer into the byte buffer using the least possible amount of bits.
     *
     * @param buf The byte buffer to write too
     * @param value The integer value to write
     */
    public static void writeVarInt(DataOutput buf, int value)
            throws IOException {
        int part;
        while (true) {
            part = value & 0x7F;
            value >>>= 7;
            if (value != 0) {
                part |= 0x80;
            }
            buf.writeByte(part);
            if (value == 0) {
                break;
            }
        }
    }
}

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